Page 3305 of 4133
AIR CONDITIONING, LOCATION OF COMPONENTS - GF83.30-P-0003-01GH 
Location of components in passenger compartment  
Fig. 50: Identifying Air Conditioning Components In Passenger Compartment (1 Of 2)
 
Location of components in passenger compartment
 Air conditioning control module function GF83.30-P-2001GH
 Refrigerant circuit function GF83.40-P-2001GH
 Temperature control, function GF83.57-P-2000GH
 Heater booster (ZUH), function Engine 612.963GF83.70-P-0005GH
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
me  
Saturday, October 02, 2010 3:23:15 PMPage 61 © 2006 Mitchell Repair Information Company, LLC.  
     
        
        Page 3306 of 4133
Fig. 51: Identifying Air Condi tioning Components In Passenger Compartment (2 Of 2)  
Location of components in passenger compartment as of 12/99     
Fig. 52: Identifying Air   Conditioning Components 
- Location Of Components In Passenger 
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
me  
Saturday, October 02, 2010 3:23:15 PMPage 62 © 2006 Mitchell Repair Information Company, LLC.  
     
        
        Page 3307 of 4133
Compartment As Of 12/99 
Location of components in engine compartment  
Fig. 53: Identifying Air Conditioning Components 
- Location Of Components In Engine Compartment 
Location of components, refrigeration technology part up to 11/99
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
me  
Saturday, October 02, 2010 3:23:15 PMPage 63 © 2006 Mitchell Repair Information Company, LLC.  
     
        
        Page 3308 of 4133
Fig. 54: Identifying Refr igeration Components - Refrigeration Technology Part Up To 11/99)  
Location of components, refrigera  tion technology part up to 12/99   
Fig. 55: Identifying Refr  igeration Components 
- Refrigeration Technology Part Up To 12/99
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
me  
Saturday, October 02, 2010 3:23:15 PMPage 64 © 2006 Mitchell Repair Information Company, LLC.  
     
        
        Page 3309 of 4133

TABLE OF CONTENTS, AIR CONDITIONING (TAC) FUNCTION DESCRIPTION - GF83.30-P-0999GH 
MODEL 163 up to 31.8.01 with code (580) Air conditioning or Tempmatic for USA  
AIR CONDITIONING CONTROL MODULE FUNCTION - GF83.30-P-2001GH 
MODEL 163 up to 31.8.01 with CODE (580) Air conditioning or Tempmatic for USA  
The following components are integrated into the air conditioning control module (S98): 
Blower switch (1): with 0 setting and 4 levels. 
 The blower switch (1) is not available as an individual part. 
Temperature selector wheel (2): with the "Blue", non-heating setting and the continuously variable heater 
setting. 
 When set to the indented position "blue" 100 % recirculated air is provided. 
Air distribution switch (3): with the settings: Defroster vents, footwell, center plane and intermediate settings. 
Recirculation switch (  ) : 100 % recirculation without time limit, when diode illuminates. 
AC button (  ): Diode illuminates, 
Refrigerant compressor ON cooling mode/air dehumidification Diode is not illuminated, refrigerant compressor 
OFF no air dehumidification/coolin
g mode 
 Air conditioning (TAC) function GF83.30-P-0001GH
 Ventilation system function GF83.10-P-2000GH
 Heater circuit function GF83.20-P-2003GH
 Air conditioning control unit function GF83.30-P-2001GH
 Refrigerant circuit function GF83.40-P-2001GH
 Temperature control, function GF83.57-P-2000GH
 Heater booster, functionEngine 612.963GF83.70-P-0005GH
 Starting heater operation, functionEngine 612.963GF83.70-P-2000GH
 Terminate heater operation functionEngine 612.963GF83.70-P-2002GH
 Regulate heater operation, functionEngine 612.963GF83.70-P-2004GH
 Cancel heater operation, functionEngine 612.963GF83.70-P-2005GH
 Air conditioning, location of components GF83.30-P-0003-01GH
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
me  
Saturday, October 02, 2010 3:23:15 PMPage 65 © 2006 Mitchell Repair Information Company, LLC.  
     
        
        Page 3310 of 4133
Fig. 56: Identifying Blower Switch, Temperature Selector Wheel And Air Distribution Switch 
AIR CONDITIONING CONTROL MODULE, LOCATION - GF83.30-P-2102-02GH 
The AC control module (N19) is located behind the center console to the left of the evaporator housing. 
Fig. 57: Identifying AC Control Module
 
 Blower switch, location/task/design/function GF83.25-P-2100GC
 Air distribution switch, location/task/design/ function GF83.25-P-2101GH
 Temperature selector wheel, location/task/ design/function GF83.25-P-2102GC
 Air recirculation switch, location/task/design/ function GF83.10-P-2117GH
 AC button, location/task/function GF83.30-P-2103GH
 AC control module location/task/function GF83.30-P-2102GH
 All-activity module, location/task/function GF54.21-P-4110GH 
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
me  
Saturday, October 02, 2010 3:23:15 PMPage 66 © 2006 Mitchell Repair Information Company, LLC.  
     
        
        Page 3311 of 4133

AC CONTROL MODULE LOCATION/TASK/FUNCTION - GF83.30-P-2102GH
MODEL 163 up to 31.8.01 with CODE (580) Air conditioning or Tempmatic for USA  
AC BUTTON, FUNCTION - GF83.30-P-2103-01GH 
Function  
Pressing the AC button (  ) switches on the cooling mode. 
AC button (  ) pressed 
Diode is illuminated, cooling mode/air dehumidification, refrigerant compressor ON 
AC button (  ) not depressed 
Diode not illuminated, no air dehumidification/no cooling mode, refrigerant compressor OFF  
The AC button (  ) is connected to the A/C control module, which regulates the refrigerant compressor 
through the all-activity module. The refrigerant compressor is only active when the engine is running and the 
blower switched on. To be able to determine the cut-in point for the electromagnetic coupling on the refrigerant 
compressor, the all-activity module must receive additional data from the CAN bus, such as, e.g. the engine 
speed. 
AC BUTTON, LOCATION - GF83.30-P-2103-02GH 
The AC button (  ) is located in the air conditioning control module (S98).
 
Air conditioning 
control module, 
location
 GF83.30-P-
2102-02GH
 
Air conditioning 
control module, 
task
Control of air conditioning 
Recording input signals of various components  
Internal processing of input signals  
Sending of control signals to various components  
 
 
Air conditioning 
control module, 
function
The AC control module records the input signals of various 
components, in order to check the preconditions for proper and intended 
operation. It sends control signals to the following components: 
Blending air flap actuator motor, fresh air/recirculated air flap actuator 
motor, All-activity module. 
The air conditioning (tempmatic) control module (TAC) receives input 
data from the following devices: AC button, in-car temperature sensor, 
temperature selector wheel, blower switch, icing protection temperature 
switch, blending air flap position signal.
 
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
me  
Saturday, October 02, 2010 3:23:15 PMPage 67 © 2006 Mitchell Repair Information Company, LLC.  
     
        
        Page 3312 of 4133
Fig. 58: Identifying AC Button On Air Conditioning Control Module 
AC BUTTON, LOCATION/TASK/FUNCTION - GF83.30-P-2103GH 
MODEL 163 up to 31.8.01 with CODE (580) Air conditioning or Tempmatic for USA  
EVAPORATOR HOUSING, POSITION - GF83.30-P-2104-01GH 
The evaporator housing (1) is located below the instrument panel. 
Fig. 59: Identifying Evaporator Housing
 
EVAPORATOR HOUSING, FUNCTION - GF83.30-P-2104-02GH 
 AC button, 
location GF83.30-P-2103-
02GH
 AC button, taskThe AC button is used to switch the air conditioning system on 
and off. 
 AC button, 
function GF83.30-P-2103-
01GH
 
2001 Mercedes-Benz ML320 
1998-2005 HVAC Climate Control - 163 Chassis  
me  
Saturday, October 02, 2010 3:23:15 PMPage 68 © 2006 Mitchell Repair Information Company, LLC.